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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Current assets    
Allowances for receivables $ 0 $ 257
Stockholders' equity    
Members' capital, par value (in dollars per share)   $ 0
Members' capital, shares authorized (in shares)   500,000,000
Members' capital, shares issued (in shares)   67,983,095
Members' capital, shares outstanding (in shares)   67,983,095
Class A [Member]    
Stockholders' equity    
Common stock, shares issued (in shares) 22,892,293 0
Common stock, shares outstanding (in shares) 22,892,293 0
Class B [Member]    
Stockholders' equity    
Common stock, shares issued (in shares) 145,057,375 0
Common stock, shares outstanding (in shares) 145,057,375 0